Hi ,
This morning I did a simple testing about
[cocurrent programming] + [Servlet] :-)
0
a
* I use J2SE1.3 + Jsdk2.1 as Servlet engine
* I use J2SE1.3 to start two Java Applications
b I use 3 "DOS Command Prompt" :
* one for Servlet engine
* one for the first Java Application which use URLConnection
to communicate to my Servlet.
* one for the second Java Application which use URLConnection
to communicate to my Servlet.
1
a the the following is my Servlet code:
*************************************************
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.net.*;
import java.util.*;
public class servlet_ht extends HttpServlet {
ObjectOutputStream os=null;
ObjectInputStream is=null;
String s_tmp=null;
Object sync=new Object();
public void init(ServletConfig config) throws ServletException {
super.init(config);
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException{
int i=0;
synchronized(sync){
System.out.println("get a GET...");
try{
response.setContentType("application/octet-stream");
os=new ObjectOutputStream( response.getOutputStream() );
os.writeObject("in GET=aaaaa");
os.flush();
os.close(); os=null;
while(i<10){
System.out.println("P1="+request.getParameter("P1")+"
thread="+Thread.currentThread() );
i++;
Thread.currentThread().sleep(1000);
}
}catch(Exception e){System.out.println("e="+e);}
sync.notifyAll();
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException{
System.out.println("get a POST...");
...
}
public String getServletInfo(){
return "servlet_ht";
}
}//class
*************************************************
b the the following is my Java Application code:
*************************************************
import java.applet.Applet;
import java.net.*;
import java.io.*;
public class applet_ht extends Applet {
String input=null;
public void init() {
URL url=null;
//HttpURLConnection con=null;
URLConnection con=null;
ObjectOutputStream os=null;
ObjectInputStream is=null;
String s_tmp=null;
try{
url=new URL("http://xxx.xxx.xxx.xxx:8080/servlet/servlet_ht?P1="+input);
con=(URLConnection)url.openConnection();
//con=(HttpURLConnection)url.openConnection();
//con.setRequestMethod("GET");
con.setUseCaches(false);
con.setRequestProperty("CONTENT_TYPE", "application/octet-stream");
con.setDoInput(true);
con.setDoOutput(true);
is=new ObjectInputStream(con.getInputStream());
s_tmp=(String)is.readObject();
System.out.println("in send, return from servlet ="+s_tmp);
//s_tmp=null;
is.close(); is=null;
//os.close(); os=null;
}catch(Exception e){System.out.println("e="+e);}
}
public static void main(String[] args) {
applet_ht xxx=new applet_ht();
xxx.input=args[0];
xxx.init();
}
}
*************************************************
2 The following is the "steps" of this testing:
[a] I run "java applet_ht 11111" to start the
first Java Application JUST after I
run [b]
[b] I run "java applet_ht 22222" to start the
second Java Application JUST after I
run [a]
[c] I continue to do [a] and [b] :-) :-) :-) [ This
is a little bit like playing drum :-) ]
3
2 The following is the result of this testing:
Before my arms and fingers are sour, :-) :-) :-) I have
done many times of such testing:
a in the "Command Prompt" of Servlet engine,
I always get 10 "11111" or 10 "22222", I never
find the "cross :-)" of several "11111" and "22222".
b and every time the thread name is different, for
example,
...
Thread[Thread-10,5,main]
Thread[Thread-11,5,main]
Thread[Thread-12,5,main]
...
Can this testing prove that we can lock some codes
in Servlet ? :-) I hope so, otherwise my arms are
sour for nothing :-) :-) :-)
1.99999 cent provider -- Bo ArmStrong :-) :-)
Oct. 06, 2000
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